Hard Brake Pedal Diagnosis - Toyota Corolla 2019
The brake pedal is consistently hard to press, indicating a potential loss of power brake assist. This is a safety concern that requires immediate attention.
Diagnosis Details
Possible Causes
Failed brake booster - The vacuum booster is not providing assist, often due to a ruptured diaphragm or internal leak.
Vacuum hose leak or blockage - A cracked, disconnected, or clogged vacuum line from the intake manifold to the booster reduces assist.
Faulty brake booster check valve - The one-way valve may be stuck or leaking, preventing vacuum from being held in the booster.
Seized brake caliper or restricted brake line - Less common, but can cause a hard pedal if fluid cannot move freely.
Related OBD-II Codes
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What You Should Do
Do not drive the vehicle until repaired.
Check the vacuum hose and check valve for damage.
Test the brake booster function by pumping the pedal with engine off, then starting the engine; if pedal drops slightly, booster is likely working.
If no change, suspect booster failure.
Inspect for vacuum leaks and ensure the booster is receiving vacuum.
Replace faulty components as needed.
Related Repairs
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
